1) Add to the end 2) Append 3) Hang on 4) Tack 5) Tack on 6) Tag on 7) To add something to the end 8) To append or annex 1) Tack on 
to add at the end or afterwards
• (v. t.) To add after something else has been said or written; to ANNEX; as, to subjoin an argument or reason.
Sub·join' transitive verb [ imperfect & past participle Subjoined ; present participle & verbal noun Subjoining .] [ Confer Old French subjoindre , Latin subjungere . See Sub- , and Join , and confer Sub...
[v] - add to the end
to add at the end, as of something said or written; append. · to place in sequence or juxtaposition to something else.